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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ca441b7e884bbfef68f5790c24205bca8adf7c2d8f4d523cc2801a9d96d1b1' 
  AND token = 'RlO1/xIyOryCpd+MC2h94AFkZpiN06+DwZrwdBi0hek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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