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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1039a9f540fae1f6fba7f3c567baacf73dd61dc769e313a43c0c1ac6a1acd0' 
  AND token = 'n5DLw1TQfkzXSdtXQW0FfRkSNSm5hHBKuANvSJ9/r7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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