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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9230cb01e00c36579a1f308e2b6f5ada047e35bf80f18b65d07d03993b66c0f0' 
  AND token = 'UTr5RFcXe7UJbEd9m/llbye3GknZhP4eHxB8jc7CyaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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