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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c498b9694af8fd3e00e06112b8d2c3f1834111d571bb483de32a049882e581e1' 
  AND token = 'hHtTD9hMxM/fjCGjU6QI5QbOW2qZjsgtrPpX6OOndB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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