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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c36f68d7d8b7f0948ceb1a22e3b6c145fd252fb5ef47c13881a1c5b85ae434' 
  AND token = 'TerPnmgJlh4oJPITAfEC1O1198OoZdyuQiM4oGm1jX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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