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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd306c80754309be768718a574812fb1db0c840822fdced9db2bd39b500db091b' 
  AND token = 'lmjEHNk5VCU+6g50MF1C2p7Dj4T/SjNRzcuk6Opwk6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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