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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366752755eeef325b42a55b026fb54a0eca0ea7dff5797958d8cf3fe26383ea9' 
  AND token = '6W/YCYVGuTNoZvI3prUb7SqV6g3Zih3lNgZw7y0BtFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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