SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d216bcb8d2867c4b5629cf8cb8cf4a2bf5644278a9387d924a51a015177ee5' 
  AND token = 'TlpQ+oKUuYxe0scLhN+VYcDd2ART2jn+ZaYsG+JCbrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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