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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900cc9e2840c8b915a65ea2018b1d7087fc54d88113e14856ad4062f5981c1a1' 
  AND token = 'Ko7SgwKzAXe/Mpx8VyV74SQrP4th0XggtRcEewvGhR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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