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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4198cd2cc71b5ef5a4352d21c3a99a7277d64bd99baede774efa63fcc6443ff' 
  AND token = '3oT+shMQ1HGo3+wdlao8qcDCMssQHOqTkEY+2u1OajY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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