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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775bda8d165b7fbe983f12f0785ac49414ffc26f805a15c185902d9e070e41eb' 
  AND token = 'K7C8UU8QAikYjpGEx9F9maPi29U9AtsdbLogitBYcSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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