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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7334be324456592f34e6e98819788f8af2767038b7e24e825702ebc2efc27fe4' 
  AND token = '/i3AdUiSGVj+WOuvOhCkpoMpctWUc3egB/lS/yHSn9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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