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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dd816f9c3e0cfc0dee5cefa33160df61143f1f7dc8c8f9a57a75b73ca308c8' 
  AND token = 'Qvlsk0hmtBTWRUDR2lfYmgE34GyJJMqbHuIradcwowI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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