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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0a6f7b991b8d7f863c2beb5112d11ac2f7a37385262eca4d92cb975d448612' 
  AND token = 'QTa6EV3spvpgryPyBXzxetvKOb2d5rKR8jIJF52aMhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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