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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f017eb56f778a72ce043d685cee9d6c146925af366867de1f31939c7b5ec72d' 
  AND token = 'BGCE1+oTDuZVC2pRl2/+LBnC5OOlZuVuiB35CkZIsY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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