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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2a08c60bc53805cff86a32668699502630b687cd86df43cc07c600b7db0810' 
  AND token = '3BgYL/HkpcQIKglgE5QjORxZI5WUO7E24iF6UQnTa4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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