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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb1352ccb47962f25f5463b1de5f8cbbd1ac358bd57d0aa26faa3cd822e740f' 
  AND token = 'bmw5jQ4DtAyoxRMM95XrsX1TACJ7heTveJNtAo8JEsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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