Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d77f460fcb3219766a4d63bf685b759a92d650ef23a1d6619ed24fa8eca3993' 
  AND token = '1vKfrQC9duA0ZUQNhDXg5XDpSbetfsYgm9kkE+pnFG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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