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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af61763bc7e9f6bd31be031030d313ea17ddc23caa3e7ffc9cc00ddfc19e8ab6' 
  AND token = '4OSGn9LkR9r5iSOCHYvaLBHTLb2nzJkEMIhhUSh21rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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