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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a1681d6c28d1c81b74e72784b3f8d0868502e0bd4b51417fdf2243ee487de0' 
  AND token = '+jGhtaib6w20nN0HTZIB/Hespi3uO2UBgpquQg7kGh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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