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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9262e3c0208b8874fb96c330ea4e7ecedcac389bd59ca6a1e660ca8ac9b7689' 
  AND token = '/7YbOEBqAZhBTDHPHkIkPkimwFGVnn4sUV+7UgLwdtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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