SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22079d7a3a2f4923a8eaafe8c709a1c2b554326ae0f3a961547ff23c815689bb' 
  AND token = 'U8ywYXVQuyppEYLjA7j6NI0zY5KBP54JAbRqSx3pNPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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