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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bbca806d82867c0d9815c7a3a505f73873d5ceb0e2fb4f4b026adda6400a91' 
  AND token = 'UELMvWi8bVzCknIlLe0kBxdIB+1mbi/qk1zdOYiH8b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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