SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377f4241c2b01ddabc467aca30a33f53ff1f429b3835a98bb2ce056df9cd571e' 
  AND token = 'c/B9rwbRiYTntDH7JeUV+LHYPT9WmhAyXEYXvjh9Dvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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