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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a051ad0ec4c613bc76ae4aab61276d7fa6b9e421c765fe8ae33826de19a4c7' 
  AND token = 'zDIq5kdRXJtWYb/7VKTQWddLjuw/JINNkCn6zQFkXCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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