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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32780fd4eaf03202a3080fe9e1ee1bbd25c1d98072d4e3f87c3771da84594ca0' 
  AND token = 'QI4c50jOk0xeJ0J6FLeB0bPQfU95JmUFJeN/SCNhzU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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