SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3053d97b9dd4f9f6ba0d0a398471f455fa0c6861f21a8d666d34f8055a6403b' 
  AND token = 'lg+N5S+xkVjG3HPTMebPFzXi5BnWQGOo3lKPnRDNQsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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