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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21bc6d6806ae8471c2046f5cdb1d33bca0ca0db0ee65d56ca7a73ae3367559a' 
  AND token = 'PVWiacUcRQw66X8CS1YZaB5kIwEu7W+XohjFiytjM/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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