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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9305c9c5150376113f9fb079bf63b521089c6f26eb0594d20d9e2a90fa23d999' 
  AND token = 'iRKvloKHvepAHpzqMdICRUdqN7B7uc8ExZ8ojnt6PD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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