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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbd550e42963ecb9d84b95ae126cf7716017e8f3ddbf118438c03f815664271' 
  AND token = 'Y/j8tvWoailUgTPoRmbjvzbFJzJMT9SeGiId2p9om1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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