SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1a8221d6b9d54b2d799ac64966c5b5b8c404fce4357b700c028433b552918a' 
  AND token = 'SzI4gFxAI0LwwKGzgPUUD9GhXw2NzQt4vsZHusUAPUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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