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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce8f1ebef43911881d36b8e00c3a96524d74fc63e77448654fcc586d029ae1e' 
  AND token = '4LV/OUrge+7Z3p0Mj0oEmXOwMrHwz10fuZv3nwzXSas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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