SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0bf90c214c8e2c7f1c8cf4d227f01e45a66641976ca0cb9501c341987cd714' 
  AND token = '/vhHdVbCYK6CRANLnXqxIXTrs/o3ns+EHHpsZGC6XgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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