SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f82d1f6ae04bb41bb4407d115ddcc5912ceabbfde82fd09c50c383012ecd339' 
  AND token = 'GONzuq8jJ06TCwYzUKY8XqJE6oKQpn0jjZ3Ua9sAGB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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