SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930563891f24f3aca730b261906c801ba0447d301ea8a192d38438fd0b8b8c97' 
  AND token = 'wLtKZBHx6qqJZYBubvuY6j984kXnLesATgMYf6DlU2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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