SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6518db3e00741e0cd7a00a423bc713ff61d8fd8c9680e0842e902351385996c4' 
  AND token = 'Fcf5ruXTsb/wa6GBMsqE7djNtLCfPgyLoJKGzxRgmuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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