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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35f80636c005898a23eaf80b84c2d45bf5e4ecb5ba0c28ad19dd921bd4491da' 
  AND token = 'xviiTs4FKrv/6Z4mCfcW/NVwMnhObTYaiJEeiNstGVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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