SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b25674ad2ff43bd6ae1d38e4d3ccb4b507d8815ac1278368fd419561f89e84b' 
  AND token = 'lVhvVnxij9Y7RtSw6Ad3Y/AQW6+0FuqJUzeOco3V35U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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