Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b87d668969322bde69d5d17d9a4376b1671e96b90e0dc9122087c68526ed0f4' 
  AND token = '/QcXCnNDQpZi2vK97BSNUQTGNr28+mWWJ3sAozJ4n24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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