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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa5f69778d600d445e371925f5e4e5819bbcac85f7b86d1a7102f1599dace4e' 
  AND token = 'gVpucrwHCMcv5T6d5guTb74a0PcuM8HP+TAn8xoZ1ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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