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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bfbdbf347c969d80c70ef085235efad00b62d186272fcdd810d2269e8ea34d2' 
  AND token = 'ev9u6YmfZFd/JiEug1/Y35aKwtOnD7FWL74IdC6WywQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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