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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00241ccafa4435c498ebb2ace3288dd7f93e0cba48ed6d3e85e54887578c8fc5' 
  AND token = 't1CXSHS8AT4770teRMXh96WYhWp5BaPcXTsXTAey1NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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