SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060cb5732ecf47c4677e5830abd371a8f3169b7a8d40800577cb65fdb295ab81' 
  AND token = 'GESmo7Uk3dKazbmSNulkXZbJOF9voXGDPn6+l5JALXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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