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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e928e02798b2b4534e097d62677f957f76f71f7b4a57cebb622739bfb9e9a8' 
  AND token = '8fVLXeNFZKxQ66dbRQ4KaALyDX4hRfhyuxq0kHpTMmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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