Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccb3fb9b4b38b32a65edc7338683870c6dde0c28ecf3d496c0f7cbdf2c46770' 
  AND token = 'raQ8L6ikfSUsFEtXDPBliDPFZ5YIWkBh4aLQJODHvYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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