SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5b7547fef56222fc697a486ddfab53993938734a3bf88ea8a445f44f24f524' 
  AND token = 'HgP+nPNZAIyLgdZdhEoo/7jxOhJspo1SoGQXJkWOizs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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