SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5028170d81ea140d394d8f1d4cf9d0001e199e8be78002ea4f3be605f4fee9' 
  AND token = 'QO9nI5EqHX8s1utP4QFZh5CEC4vW9nkY8jbKfsYNWbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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