SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69333400b44ab9fe10574d8b9ef88421dc55f773c4630cdbcaffab13cd61eeb3' 
  AND token = 'NmczwgTwZnlHpFduSQmB1DApIvVMCJsP/AhUlMBZGXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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