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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06866772ec71630a6520d3d8fa8023c4bb80f9b637fc4c6f0bd393c64744b8f3' 
  AND token = 'x3wZnzr1+g4oMNjSseXjg/TS/XxTxqLggRVn/WET1/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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