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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0dbdf75243c547fc8e69cae1085f6bec181f632d93dc26d4b7a4a791032c05' 
  AND token = 't9iQRk41UU/tihzLOR6cVQkBMNKBBD6e3V1JiWOz9zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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