SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199abf2f0f05734a8e576bd3dbace31cf79844ed60c23afbd941dc95fd8c2b0b' 
  AND token = 'CqkFYMVBZG+tvAui9BPZtEjltN//SU+hGWhtJ8YDmOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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