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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137eb0e87cb6f68457e974c93dc05e4d4b5912ef3320d7a7af4e5775a73bb2bc' 
  AND token = 'VynOpJ+tvZsyshHs0c9cl5rjMaLmwhtg9OwIt9ypgPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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