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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281cc1ccb920f294d383be70a4dd40f30588545db9f53c580adf16779d8aeeea' 
  AND token = 'v4nhaM1C0keLfOyGrmImTyutgLcCd2it3xyRjqQwgmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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