SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d95087b56eb69239d1cd1678fea4f4b713863a695cb3727193eb66d1d32b28d' 
  AND token = '1JNTDOAOKkUkYhZVK/EaTSUp/GzayQKB2JsIhvMSFBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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