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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0fbd0638f55e9288ba483421235f5fd6a7f11e08e46aa4876d2b4065e89937' 
  AND token = '9Ui+aUk4Hh8mIanRHudIC3DQJ3l8tHWZoC7oH5ODKnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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