SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c641486de2850ea3086d15f777d0e511129c8b24e1652a7b4972f14683b13bf' 
  AND token = 'tllrcoDvFrUbtJXGtuDkrUOsOePYHZlhqcKCLzRvx7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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