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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcbaf55cc535e33ad38d39f26a5a5ae6a219977af7d97a9eb4f7800eb919a96' 
  AND token = 'kL8LKh/GSwGQceAe3R/5DLiPLSfVozURWN7eyPENQz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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