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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a3d5fad62e4bfb5a459642542263d0731111fbae729e0b77c0536b56c145fe' 
  AND token = 'GWZ6/1a6Gi8Oz6Q2omm8aIWpyaoqfK80lTU5P3yHtv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}