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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17d9445ba0c278fcdc8fefca516cc409596c5f763496b0a4bd37265cb19baa6' 
  AND token = 'BDs5Bfb2LB01H5Hc6A4lsSC9pDsHKmAQpn3ygQg9v9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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