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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108debb6d4271c1461fd4338f53100f295634a9bc3344a10740e384780e27d31' 
  AND token = 'ZRl2BWzf6Z6AAEAVoEKn9Mhx0veE9ONtvI9KGNbbxuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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