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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bd063b2908849e670716706c9383277ca0fcf1ddaa8c60a511966fbdfa0b6a' 
  AND token = 'QQ+kNoacCC/b3tf13/dJ5khnXkJMNxrXDMyubQTDo9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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