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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da9b9cc8a7e320384eb27bc7bcad13e9d6940c9ab816d6fc0e86b68fcaa2c4f' 
  AND token = 'pDiFR8O4xJzrJ3IJfAEdPU86p5WbTnAqJhgA2LVLLcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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