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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2329ca675ce08ece998e1d19b2b279ca7053de42eb31f1145fc43eaaf1f1abd5' 
  AND token = '0xDk98F44DZwJPLlpYv5dCG0rsdqeM/6AF/0jviAd9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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