SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4b4a6ee7c865149646c75891448416ac7a6a3722ac91bf19f2828cfabd38f1' 
  AND token = 'qmfSTk5JF7Nn/Ksh8YTwR7XjHy5lYp+UaPQDf6/O4Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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