SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb9d228bc53d119f84bf521268befb7383a8db8b7c8fb961dddf03094949015' 
  AND token = '4YFrXAPhoQEyktyVECzDMt3G2q7C17VLB0P/ZXk+Jwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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