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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9827756ff8bf3ba2590f5c7d2206325cf9261f3b5b66610a75b52d55e819f91' 
  AND token = 'R38qHTc9swUiwaewF8SWRbzrDiBT+1oGQFI0/z9QZkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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