SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d8f8a59d4dc50bf8a2af6c3e77734889e6952d36c6cc93e7bb6c83f867645e' 
  AND token = '/jFyzqhFrEKfFlwMn5sxV/fDKBVT1AJhhxJ6cB9x4p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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