SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5835179e9ea5274c699511424cfbe9eba2e625436b935a0eb4eee267ff96b842' 
  AND token = 'LJemhi1luw0KNMHxjGSPZqVJArx8VhrrYySYqHBbRkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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