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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ec09ebb7c4477b55c0d900b42dcb4a744964880f460fc12987ab272dda787d' 
  AND token = '19L6Ymwb7YCgNibI1+GaIzDuOcGFEKbQidxorc/vY0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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