SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14653605d7228eef2f17a71cbdf9ce84e758b241a93e0de4e9e7a9cc91862c01' 
  AND token = '4AU6+4ypnBpPYrJ/NeM7hGQpZfzHPbV1cN/+sRwjXXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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