SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993c294a1b3b4de658f62ac64e16556911a797588e00f28af52b2abaf3f2199e' 
  AND token = 'emFJ/PHCRKX/mw0P1VPaNqG6xZkzMkBh7tJ/89XXdTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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