select count(1) = 0 from metadata where uuid = 'b940d071-d781-46f0-82b6-62b3f3934f2c'

[
  {
    "Plan": {
      "Node Type": "Aggregate",
      "Strategy": "Plain",
      "Partial Mode": "Simple",
      "Parallel Aware": false,
      "Startup Cost": 8.45,
      "Total Cost": 8.46,
      "Plan Rows": 1,
      "Plan Width": 1,
      "Actual Startup Time": 0.053,
      "Actual Total Time": 0.054,
      "Actual Rows": 1,
      "Actual Loops": 1,
      "Output": [
        "(count(1) = 0)"
      ],
      "Shared Hit Blocks": 0,
      "Shared Read Blocks": 4,
      "Shared Dirtied Blocks": 0,
      "Shared Written Blocks": 0,
      "Local Hit Blocks": 0,
      "Local Read Blocks": 0,
      "Local Dirtied Blocks": 0,
      "Local Written Blocks": 0,
      "Temp Read Blocks": 0,
      "Temp Written Blocks": 0,
      "Plans": [
        {
          "Node Type": "Index Only Scan",
          "Parent Relationship": "Outer",
          "Parallel Aware": false,
          "Scan Direction": "Forward",
          "Index Name": "metadata_uuid",
          "Relation Name": "metadata",
          "Schema": "public",
          "Alias": "metadata",
          "Startup Cost": 0.43,
          "Total Cost": 8.45,
          "Plan Rows": 1,
          "Plan Width": 0,
          "Actual Startup Time": 0.044,
          "Actual Total Time": 0.045,
          "Actual Rows": 1,
          "Actual Loops": 1,
          "Output": [
            "uuid"
          ],
          "Index Cond": "(metadata.uuid = 'b940d071-d781-46f0-82b6-62b3f3934f2c'::uuid)",
          "Rows Removed by Index Recheck": 0,
          "Heap Fetches": 0,
          "Shared Hit Blocks": 0,
          "Shared Read Blocks": 4,
          "Shared Dirtied Blocks": 0,
          "Shared Written Blocks": 0,
          "Local Hit Blocks": 0,
          "Local Read Blocks": 0,
          "Local Dirtied Blocks": 0,
          "Local Written Blocks": 0,
          "Temp Read Blocks": 0,
          "Temp Written Blocks": 0
        }
      ]
    },
    "Planning Time": 0.129,
    "Triggers": [],
    "Execution Time": 0.089
  }
]

select count(1) = 0 from metadata where uuid = 'b940d071-d781-46f0-82b6-62b3f3934f2c' and requested_at < now() + interval '1 minute'

[
  {
    "Plan": {
      "Node Type": "Aggregate",
      "Strategy": "Plain",
      "Partial Mode": "Simple",
      "Parallel Aware": false,
      "Startup Cost": 8.46,
      "Total Cost": 8.47,
      "Plan Rows": 1,
      "Plan Width": 1,
      "Actual Startup Time": 0.1,
      "Actual Total Time": 0.101,
      "Actual Rows": 1,
      "Actual Loops": 1,
      "Output": [
        "(count(1) = 0)"
      ],
      "Shared Hit Blocks": 0,
      "Shared Read Blocks": 4,
      "Shared Dirtied Blocks": 0,
      "Shared Written Blocks": 0,
      "Local Hit Blocks": 0,
      "Local Read Blocks": 0,
      "Local Dirtied Blocks": 0,
      "Local Written Blocks": 0,
      "Temp Read Blocks": 0,
      "Temp Written Blocks": 0,
      "Plans": [
        {
          "Node Type": "Index Scan",
          "Parent Relationship": "Outer",
          "Parallel Aware": false,
          "Scan Direction": "Forward",
          "Index Name": "metadata_uuid",
          "Relation Name": "metadata",
          "Schema": "public",
          "Alias": "metadata",
          "Startup Cost": 0.43,
          "Total Cost": 8.46,
          "Plan Rows": 1,
          "Plan Width": 0,
          "Actual Startup Time": 0.092,
          "Actual Total Time": 0.093,
          "Actual Rows": 1,
          "Actual Loops": 1,
          "Index Cond": "(metadata.uuid = 'b940d071-d781-46f0-82b6-62b3f3934f2c'::uuid)",
          "Rows Removed by Index Recheck": 0,
          "Filter": "(metadata.requested_at < (now() + '00:01:00'::interval))",
          "Rows Removed by Filter": 0,
          "Shared Hit Blocks": 0,
          "Shared Read Blocks": 4,
          "Shared Dirtied Blocks": 0,
          "Shared Written Blocks": 0,
          "Local Hit Blocks": 0,
          "Local Read Blocks": 0,
          "Local Dirtied Blocks": 0,
          "Local Written Blocks": 0,
          "Temp Read Blocks": 0,
          "Temp Written Blocks": 0
        }
      ]
    },
    "Planning Time": 0.27,
    "Triggers": [],
    "Execution Time": 0.15
  }
]