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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77e8e1b5c33fc41684eceea091bed094332aab4b20d0fef0833e4b116a39118' 
  AND token = 'qfn4t8rQoSdxrf+aWMiNdYuc+zveRnRcrDnF09ZqKsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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