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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd4170864beeff6db81e69e7b6723d96d885c30ec7d061b77a12a7e16b56e35' 
  AND token = 'IhBOqcuK91ttcpHHoT7xcIm2SHYRt5UiPVzXtha6Mks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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