SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aebabffa764cd6e5719b7a841e99b0a195934a816ed5e1948018c3eab19134d' 
  AND token = 'lunEbIZCM5UQ7edR3vseHLInGmCehrjMy31555lutXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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