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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79aefe89a3557340616ccdfc69180d19fd9a8c41fc77300410a49a0e7d4f8ec' 
  AND token = 'DpJbNN8qLULQx/hpUpVT7bLAApsb4eqlcliaK0FSEnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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